Base64 Encoder & Decoder
Convert text to Base64 or decode a Base64 string back to text. Runs entirely in your browser — nothing you type is sent anywhere.
How it works
Base64 encodes arbitrary binary/text data into an ASCII string using 64 characters
(A–Z, a–z, 0–9, +, /), padded
with = so the output length is a multiple of 4. It is not encryption — anyone
can decode it back to the original data.
Examples
| Input | Base64 |
|---|---|
hello | aGVsbG8= |
Hello, World! | SGVsbG8sIFdvcmxkIQ== |
{"id":1} | eyJpZCI6MX0= |
| |
FAQ
Is Base64 encryption? No. It is a reversible encoding, not a security mechanism — never use it to protect sensitive data.
Why does the output end with =? Base64 groups input into
3-byte chunks encoded as 4 characters; = pads the last chunk when the input
length isn't a multiple of 3.
Does this work with Unicode/emoji? Yes — input is UTF-8 encoded before Base64 conversion, so non-ASCII text round-trips correctly.